Question:
An n-p-n transistor can be considered to be equivalent to two diodes connected. Which one of the following figure is correct?
An n-p-n transistor can be considered to be equivalent to two diodes connected. Which one of the following figure is correct?
Show Hint
The base is p-type and the emitter and collector are n-type, so both diodes have their anodes joined at the base.
Updated On: Nov 12, 2026
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
An n-p-n transistor has a p-type base between an n-type emitter and an n-type collector. It behaves like two p-n junction diodes joined back to back.
Step 2: Diode Directions
A diode conducts from p (anode) to n (cathode), and the arrow of the symbol points from anode to cathode.
Both junctions have the p-type base on the anode side.
Step 3: Draw the Equivalent
Both diode arrows therefore start at the base B and point outward, one towards the emitter E and one towards the collector C.
Step 4: Compare the options
Only the figure in option (B) shows both arrows pointing away from B, so (B) is correct.
Final Answer:
The correct figure has both diodes with their anodes joined at the base, which is option (B). \[ \boxed{\text{(B) }\text{figure with both diode arrows pointing away from the base}} \]
An n-p-n transistor has a p-type base between an n-type emitter and an n-type collector. It behaves like two p-n junction diodes joined back to back.
Step 2: Diode Directions
A diode conducts from p (anode) to n (cathode), and the arrow of the symbol points from anode to cathode.
Both junctions have the p-type base on the anode side.
Step 3: Draw the Equivalent
Both diode arrows therefore start at the base B and point outward, one towards the emitter E and one towards the collector C.
Step 4: Compare the options
Only the figure in option (B) shows both arrows pointing away from B, so (B) is correct.
Final Answer:
The correct figure has both diodes with their anodes joined at the base, which is option (B). \[ \boxed{\text{(B) }\text{figure with both diode arrows pointing away from the base}} \]
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